Shock strut



Nov. 26, 1940. c, JOHNSON SHOCK STRUT Filed Aug. 9, 1939 II II nvyszvron. 501V ATTORNEY Patented Nov. 26, 1940 o UNITED STATES PATENT OFFICE P can v. Johnso South Bend, Ind.

- Application August 9, 1939, Serial No. 289,097

' 3 (Haims. (Cl. 267-64) This invention relates.to shock -struts, and is shown, this deflector is'mounted on the partiillustrated as embodied in a strut intended to v tion 24 by headed screws 22 locked against turnabsorb the force of landing an airplane. ingby a wire 34 passed through openings in their In such strints, oil is forced under high presheads. I It is spaced away from the orifl'ce 26 by 5 surethrough an oriflce tooabsorb the energy of spacers ll sleeved on the screws 32, sufliciently .6

her and produce a mist of mixed air and oil. ter of theoriflce 26. f

- landing by converting it into heat in the liquid to insure that the eflector will not in r used in the strut. Where the liquid from the g with the passage of liquid through the oriflce orifice discharges freely into the compressedair 26., Preferably the deflec r 20 is conical,- with therein, it tends to spurt up into the air cham its apex facing toward and ed with the cen- 10 When this mixture is later drawn back through; The deflector 30, formed and arranged as de the oriflce into the hydraulic chamber or the 1 scribed above, deflects theliquid radially outstrut, there is a tendency to cause foaming, ward, as it issues from the oriflce 26, thereby thereby reducing the density of the liquid. minimizing breaking up and foaming.

An object of the present invention is to pre- While one illustrative embodiment has been 15 vent this breaking up 01' the oil as it issues from described'in detailfitis not my intention to limit theoriflce, by discharging it against a deflector; the scope of the invention to that. particular paced far enough away. not to interfere with embodiment, or otherwise than by the-terms of the passage of the oil through the oriflce, and the appended claims. I

which deflects the oil radially outward. Preier- I claim:

, ably the deflector is conical in form. with its 1. A shock strut having a hydraulic chamber pex facing and alined with the center. of the and an air chamber separated by a P firmed oriflce. with an oriflce, means for forcing liquid from V The above and other objects and features of the hydraulic chamber to the air. chamber the invention will be apparent from the :lenowthrough said oriflce to absorb energy, and a de 8 ption of the illustrative embodiment flector mounted on the air chamber side of-said shown in the accompanying drawing, in which: oriflce and spaced from the oriflce far enough Figure 1 is a section longitudinally through not to interfere with the passage of liquid and a shoci: strut embodying my invention; formed to deflect liquid from the oriflce radially Figure 2 isan enlarged section of the part prooutward. i 3 vided with the oriflce and the deflector: and 2. A shock strut having a hydraulic chamber re 3 is across section on the line 2-3 andanairchamberseparatedbyamt fi of Fi ure 1 showing in top plan view the parts with an oriflce, means for forcing liquid trom pp aring in Figure 2. the hydraulic chamber to the air chamber The airplane shock strut shown in the drawthrough said oriflce to absorbenergy. and vide- 3 mg comprisesa cylinder 10, having anattachflector mounted on the air chamber side ofsald ment fltting l2 at its closed upper end, and a Orifice l the me 9' holiow piston l4 having ,a head slidable in the not to interfere with the e of liquid and cylinderand having an attachment fltting II at formed to deflect liquid from the oriflce radially 40 its lower end. The piston moves in a suitable outward, said deflector being conical in form 40 packing It. The cylinder may be made in one with its apex facing and aiined with the center pi ce, 1' by welding together two interfltting of saidoriflce. i pieces of tubing as shown, and is divided int a 3. In a shock strut having a hydraulic chamhydraulic chamber 20 and a compressed air ber and an air chamber separated by a P chamber 21 y a diaph a m or rigid partition 24 i formed with an oriflce and means for forcing 45 formed with an oriflce 28. A fltting 28 may be liquid from the hydraulic chamber' to the air provided for introducing compressed air. chamber through said oriflce to absorb energy- In the operation of this shoe]: strut on landa a deflector mounted on the air chamber side of in: the plane the piston ll is forced upwardly, said oriflce and spaced from the oriflce far forcing. oil or other liquid from the hydraulic enough not to interfere with the passage of W chamber 2| upwardly through the oriflce 20 into liquid and formed to deflect liquid from the the air chamber 22. oriflce radially outward, said deflector being @In order. to prevent the undesired breaking up conical in form with its apex acing and alined and foaming of the liquid, a deflector it is with the center of said oriflce. 'mmmted at the upper side of e m a. 1 cam. v. JOHNSON. II V 

